Twinning in [001]-oriented single crystals of CoCrFeMnNi high-entropy alloy at tensile deformation

被引：31

作者：

Kireeva, I. V. ^{[1
]}

Chumlyakov, Yu. I. ^{[1
]}

Pobedennaya, Z. V. ^{[1
]}

Vyrodova, A. V. ^{[1
]}

Karaman, I. ^{[2
]}

机构：

[1] Natl Res Tomsk State Univ, Siberian Phys Tech Inst VD Kuznetsova, Novosobornaya Sq 1, Tomsk 634050, Russia

[2] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 713卷

基金：

俄罗斯科学基金会;

关键词：

CoCrFeMnNi; High-entropy alloy; Single crystals; Tensile strain; Extrinsic stacking fault; Deformation twinning; STACKING-FAULT-ENERGY; MECHANICAL-PROPERTIES; SLIP; TEMPERATURE; DISLOCATION; NUCLEATION; DEPENDENCE; BEHAVIOR; STRESS; STEEL;

D O I：

10.1016/j.msea.2017.12.059

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper presents research about the tensile deformation behaviour and deformation mechanisms (slip and twinning) in single crystals of the equiatomic Co20Cr20Fe20Mn20Ni20 (at%) high-entropy alloy (HEA) oriented along the [001] direction in the temperature range T = 77-573 K. Classical studies on single crystals of pure metals and their substitution alloys with the face-centered cubic (FCC) structure, with a low stacking fault energy, have shown that deformation twinning in single crystals oriented along the [001] direction does not develop at tensile deformation. In the present paper, extrinsic stacking faults and deformation twinning in the [001]-oriented single crystals of the equiatomic Co20Cr20Fe20Mn20Ni20 HEA were detected under tensile loading at the temperature of liquid nitrogen after a strain of 5%. The critical resolved shear stress for twinning was determined as tau(tw)(cr) = 210 +/- 10 MPa. Deformation twinning in the [001]-oriented single crystals leads to an increase in the strain hardening coefficient in comparison with the slip deformation in these crystals at T > 77 K.

引用

页码：253 / 259

页数：7

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